org.elasticsearch.search.aggregations.metrics.percentiles.tdigest.InternalTDigestPercentileRanks Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch Show documentation
Show all versions of elasticsearch Show documentation
Elasticsearch subproject :server
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.search.aggregations.metrics.percentiles.tdigest;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.search.DocValueFormat;
import org.elasticsearch.search.aggregations.metrics.percentiles.InternalPercentile;
import org.elasticsearch.search.aggregations.metrics.percentiles.Percentile;
import org.elasticsearch.search.aggregations.metrics.percentiles.PercentileRanks;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
public class InternalTDigestPercentileRanks extends AbstractInternalTDigestPercentiles implements PercentileRanks {
public static final String NAME = "tdigest_percentile_ranks";
public InternalTDigestPercentileRanks(String name, double[] cdfValues, TDigestState state, boolean keyed, DocValueFormat formatter,
List pipelineAggregators, Map metaData) {
super(name, cdfValues, state, keyed, formatter, pipelineAggregators, metaData);
}
/**
* Read from a stream.
*/
public InternalTDigestPercentileRanks(StreamInput in) throws IOException {
super(in);
}
@Override
public String getWriteableName() {
return NAME;
}
@Override
public Iterator iterator() {
return new Iter(keys, state);
}
@Override
public double percent(double value) {
return percentileRank(state, value);
}
@Override
public String percentAsString(double value) {
return valueAsString(String.valueOf(value));
}
@Override
public double value(double key) {
return percent(key);
}
@Override
protected AbstractInternalTDigestPercentiles createReduced(String name, double[] keys, TDigestState merged, boolean keyed,
List pipelineAggregators, Map metaData) {
return new InternalTDigestPercentileRanks(name, keys, merged, keyed, format, pipelineAggregators, metaData);
}
static double percentileRank(TDigestState state, double value) {
double percentileRank = state.cdf(value);
if (percentileRank < 0) {
percentileRank = 0;
}
else if (percentileRank > 1) {
percentileRank = 1;
}
return percentileRank * 100;
}
public static class Iter implements Iterator {
private final double[] values;
private final TDigestState state;
private int i;
public Iter(double[] values, TDigestState state) {
this.values = values;
this.state = state;
i = 0;
}
@Override
public boolean hasNext() {
return i < values.length;
}
@Override
public Percentile next() {
final Percentile next = new InternalPercentile(percentileRank(state, values[i]), values[i]);
++i;
return next;
}
@Override
public final void remove() {
throw new UnsupportedOperationException();
}
}
}